Dominica has been nicknamed the "Nature Isle of the Caribbean" due to its seemingly unspoiled natural beauty. It is one of the youngest islands in the Lesser Antilles, and it is still being formed by geothermal-volcanic activity. The island features lush mountainousrainforests, home of many rare plant, animal and bird species. There are xeric areas in some of the western coastal regions but heavy rainfall can be expected inland. The Sisserou parrot which is the island's national bird, is featured on the national flag. Dominica's economy is heavily dependent on both tourism and agriculture.